Perhaps you should try some spelling variations:
krebsforschung uber » krebsforschung die, krebsforschung und, grossforschung uber
krebsforschung der » krebsforschung die, krebsforschung das, krebsforschung zur
present results » treatment results
2c fortschritte » 2 fortschritte, 23 fortschritte, 24 fortschritte
male cancer » care cancer
le cancer » e cancer, pre cancer
ames dans » armes dans, carmes dans, actes dans
a8s dans » ans dans, arts dans, lus dans

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %((recent results) OR (present results)) in cancer research%2c fortschritte der ((krebsforschung uber) OR (krebsforschung der))%c3%((a8s dans) OR (ames dans)) les ((recherches sur) OR (recherche sur)) ((le cancer) OR (male cancer))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((recent results) or (present results)) in cancer research%2c fortschritte der ((krebsforschung uber) or (krebsforschung der))%c3%((a8s dans) OR (ames dans)) les ((recherches sur) or (recherche sur)) ((le cancer) or (male cancer))%22".
• Adding a wildcard symbol may retrieve word variants: %((recent results) or (present results)) in cancer research%2c fortschritte der ((krebsforschung uber) or (krebsforschung der))%c3%((a8s dans) OR (ames dans)) les ((recherches sur) or (recherche sur)) ((le cancer) or (male cancer))%22*.